Stephen P. Zelnak

Martin Marietta Aggregates produces construction aggregates. It supplies crushed stone, sand, gravel, asphalt and ready mix concrete products to contractors of highway and public infrastructure, residential and commercial projects. The company operates quarries and related facilities in the US, Canada and the Caribbean. Martin Marietta Aggregates is located in Raleigh, NC.

Martin Marietta Magnesia Specialties LLC produces magnesia chemicals and lime. It provides high purity magnesium oxide based products for environmental, industrial, nutritional and agricultural applications, and magnesium hydroxide products for use in everyday materials such as plastic, rubber, pulp & paper, ceramics, sugar, animal feed, aluminum, tile and motor oil. It is a wholly owned subsidiary of Martin Marietta Magnesia, Inc. The company is headquartered in Baltimore, MD.

Concrete Supply Holdings, Inc. produces ready-mix concrete products. The company was founded on May 23, 1958 and is headquartered in Charlotte, NC.

ZP Enterprises LLC is an Independent Private Equity firm founded in 2008 by Brent Zelnak. ZP Enterprises LLC is headquartered in Atlanta.

Georgia Tech Foundation, Inc. provides educational services. It promotes the cause of higher education in the State of Georgia, receives and manages financial donations received by the foundation for support and enhancement of the Georgia Institute of Technology and assists the Georgia Institute of Technology in its role as a leading educational and research institution. The company was in 1932 and is headquartered in Atlanta, GA.

The Materials Group LLC manufactures and distributes plastic resin. The firm operates as distributors and compounders of plastic resin, focuses is on customer service; its ability to offer quality engineered thermoplastics, compounded materials and recycled resins. The company is headquartered in Rockford, MI.